I try to send mail outside from our exchagne server 2k7 through Telnet command. It is only for test purpose. whenever I can send mail from OWA, it is to be working fine but from telnet I find only sender has recognized but it didn't recognized outside username.

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This may cause for not getting DNS resolution thru the proxy server or SMTP outbound is being blocked. Have u tried telnet from the exchange server to any mail server on the outside via port 25 !…. u may test this on port 25, if u unable to connect, try out it via it’s IP address like 64.157.4.81.

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